PROJECTION OPTICAL SYSTEM AND IMAGE PROJECTING APPARATUS
First Claim
1. A projection optical system comprisinga first optical system configured to form a second image conjugate to a first image anda second optical system configured to comprise a reflective optical element which reflects light from the second image and to project a third image conjugate to the second image onto a projection surface, whereinthe first optical system has a Petzval sum with a sign opposite to a sign of a Petzval sum of the second optical system.
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Accused Products
Abstract
A projection optical system including a first optical system configured to form a second image conjugate to a first image and a second optical system configured to include a reflective optical element which reflects light from the second image and to project a third image conjugate to the second image onto a projection surface is provided, wherein the first optical system has a Petzval sum with a sign opposite to a sign of a Petzval sum of the second optical system.
55 Citations
20 Claims
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1. A projection optical system comprising
a first optical system configured to form a second image conjugate to a first image and a second optical system configured to comprise a reflective optical element which reflects light from the second image and to project a third image conjugate to the second image onto a projection surface, wherein the first optical system has a Petzval sum with a sign opposite to a sign of a Petzval sum of the second optical system.
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2. A projection optical system in which plural light beams emitted from an image forming element displaying image information on a conjugate plane A are allowed to be obliquely incident on a conjugate plane B so as to form an enlarged image of an image formed by the image forming element on the conjugate plane B, wherein
the projection optical system comprises, at least, a first optical system, a second optical system, an intermediate image of the image forming element between the first optical system and the second optical system on which the plural light beams are generally converged, an optical system having a refractive power in the first optical system being composed of only a lens system transmitting the light beams, the intermediate image being formed by only a refractive power of the first optical system, the second optical system being a reflective optical system comprising a reflection mirror having a positive refractive power which reflects the light beams and is directly behind the intermediate image, and the first optical system being configured to compensate for a Petzval sum component provided in the second optical system.
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3. A projection optical system in which plural light beams emitted from an image forming element displaying image information on a conjugate plane A are allowed to be obliquely incident on a conjugate plane B so as to form an enlarged image of an image formed by the image forming element on the conjugate plane B, wherein
the projection optical system comprises, at least, a first optical system, a second optical system, an intermediate image of the image forming element between the first optical system and the second optical system on which the plural light beams are generally converged, an optical system having a refractive power in the first optical system being composed of a lens system transmitting the light beams and a reflection mirror being rotationally symmetric with respect to an optical axis of the first optical system and having a negative refractive power, the intermediate image being formed by only a refractive power of the first optical system, the second optical system being a reflective optical system comprising a reflection mirror having a positive refractive power which reflects the light beams and is directly behind the intermediate image, and the first optical system being configured to compensate for a Petzval sum component provided in the second optical system.
Specification